JPS6217284Y2 - - Google Patents

Description

[Detailed description of the invention] The present invention relates to a traveling vehicle equipped with a prime mover and equipped with two wheels each in the front and rear, a total of four wheels, or a total of three wheels, one wheel in the front, and is suitable for riding in a manner similar to a scooter. be.

More specifically, the vehicle body frame is used as a seat and extends in the front and rear directions, and leaf springs are extended rearward from both sides below the seat, and the ends of the leaf springs support the rear axle. The engine is interposed between the two, or the front two wheels are supported by two horizontal leaf springs that sandwich the frame, effectively reducing weight, simplifying the structure, and downsizing. This invention relates to a new vehicle that ensures sufficient riding comfort.

Simple two-wheeled vehicles equipped with small, small-displacement motors have been proposed, and some similar to bicycles and others similar to scooters have been put into practical use, but these types of simple vehicles are all two-wheeled. .
Therefore, if you cannot ride a bicycle, you cannot drive it.

On the other hand, a tricycle equipped with a prime mover has been proposed and put into practical use as a light vehicle, but the rear section containing the two wheels is wide and large, and the front section containing the single wheel is jointed to enable rolling. Such tricycles are generally larger than motorcycles, scooters, etc., have complex structures such as rolling joints on the front and rear bodies, and are heavy.The displacement of the motor is also correspondingly large. This is beyond the range of vehicles and therefore cannot solve the above problem.

Therefore, we proposed a three- or four-wheeled vehicle that can be easily operated even by those who cannot drive a two-wheeled vehicle.
Moreover, in order to commercialize this product under the conditions of small size, light weight, and simplicity, and to provide it at a cost not much different from the above-mentioned two-wheeled vehicles, in order to ensure sufficient functionality such as ride comfort and handling operability, the frame, engine, etc. , there are various problems that must be solved with suspension systems and the like.

The inventors of the present invention have devised the present invention in order to solve the above-mentioned problems and obtain a compact, lightweight, and simple traveling vehicle with three or four wheels, particularly in order to easily solve the configuration of the rear wheels or drive wheels. It is.

The purpose of this invention is to make the vehicle body frame approximately equal in width to the passenger's seat, have leaf springs extending rearward from both sides below the seat, and support the rear axle with the free rear ends of the leaf springs. To provide a running vehicle that can perform the following tasks.

Therefore, the object of the present invention is to provide a frame similar to a scooter, in which the vehicle body is approximately equal in width to the seat, the rear two wheels are supported by leaf springs in a type similar to a trailing arm, and the suspension members of the rear two wheels are provided with elasticity. It functions as a damper and supports the rear two wheels with the free end of the leaf spring, so it has an excellent damper effect.The rear two wheels are rationally suspended on a small, lightweight frame with a minimum number of components, and the suspension system functions fully. To provide a running vehicle that can effectively perform its performance.

The purpose of this invention is to make the width of the body frame approximately equal to the width of the seat, so that the external dimensions are not much different from those of a two-wheeled vehicle.Furthermore, by extending the leaf springs to the left and right rearward of this to support the two rear wheels, the length of the body frame can be reduced. It can be installed with sufficient tread between the two rear wheels within the limited width of the vehicle while keeping the height as small as possible, improving the stability and ride comfort of a small and simple vehicle with two rear wheels. To provide a traveling vehicle that is secured.

A further object of the present invention is to arrange the engine in the space between the left and right leaf springs and the bottom surface of the seat, and to achieve a rational arrangement of the engine, an arrangement that is advantageous in terms of space utilization, and a rational and reliable mounting of the engine. Provides ivy-driving vehicles.

Furthermore, it is an object of the present invention to elastically support the engine toward the vehicle body frame side and to support the rear axle by the leaf spring, and to arrange the engine so that the engine is supported by the vehicle body frame in front of the end of the leaf spring. The part is placed in the middle of the leaf spring in the longitudinal direction, and the engine is placed approximately in the center vertically and horizontally on the axis of the left and right wheels, effectively supporting the heavy engine and lowering the center of gravity to improve cornering performance. To provide a running vehicle with improved maneuverability and simplified engine support.

Another object of the present invention is to construct a channel-type press-molded body with the rear part of the vehicle body frame open to the lower surface, to provide sideward bending parts on both sides of the body frame, and to attach left and right leaf spring bases to these parts. , and the engine is housed in a downward channel-shaped space, which is extremely advantageous in terms of space, and also has an advantage in terms of engine protection and cooling.
Furthermore, it provides a running vehicle that is preferable in terms of frame rigidity and strength.

Furthermore, the purpose of the present invention is to support the front two wheels between the ends of two horizontal plate springs that sandwich the body frame vertically, simplify the front wheel suspension structure, reduce the number of parts, and improve the damper function. To provide a running vehicle which is improved in terms of steering performance and is also convenient in terms of steering function.

Next, a preferred embodiment of the present invention will be described in detail with reference to the accompanying drawings. This reveals further objects and advantages of the present invention.

1 and 2 are a plan view and a side view showing the basic structure of a traveling vehicle according to the present invention.

To explain the outline of the layout of the vehicle 1, 2 is a frame extending in the front and rear directions, front wheels 3, 3, which are steering wheels, are mounted on the front left and right sides of the frame 2, and rear wheels 4, 4, which are drive wheels, are mounted at the rear. is provided. A passenger seat 5 is provided at the middle or rear portion of the frame 2, and the width of the seat 5 and the width of the frame 2 are approximately equal. A steering shaft 6 extends diagonally upward and rearward at the front, and the shaft 6 has inverted V-shaped stays 7 whose lower ends are fixed on the left and right sides of the front end of the frame.
The upper end of the shaft 6 is supported by a support 8, and a steering bar 9 is fixed to the upper end of the shaft 6, forming a steering operation section.

The frame 2, as clearly seen in FIGS. 5 and 7, has a box-like cross section, and inside thereof a plurality of channel-like cross members 2b are provided in the width direction. The frame 2 is made of a frame molded product made of steel plate material, which is combined into a closed cross-section box shape, and due to the presence of cross members 2b...
The aim is to reduce the weight of the frame and improve its rigidity and strength.

The front part 2a is one step higher than the intermediate part 2c of the frame 2, and is continuously connected by an inclined part 2d, and the front part 2a and the intermediate part 2c are formed horizontally.
The rear part 2e is formed to be continuous with the rear end of the intermediate part 2c and inclined diagonally rearward and upward, and the lower and rear surfaces of the rear part 2e are open 2f and 2g, and this part has a channel-shaped cross section that is open downward. A downwardly open space 2h is formed in the rear part 2e. That is, as shown in FIG.

Approximately L-shaped stays 10, 10 are arranged on the left and right sides of the inclined rear part 2e of the frame 2, and the rear end of the horizontal part 10a of the stay 10 is placed on the upper part of the rear part 2e, and the bent and hanging part 10b are connected to the lower part of the inclined surface of the rear part 2e. The above-mentioned sheet 5 is installed across the space between the stays 10, 10, and a fuel tank 11 is installed at the bottom of the sheet 5 between the stays 10, 10.
The inlet cap 11a of the tank 11 is located behind the seat 5.

At the lower end of the rear part 2e of the frame 2 and at the lower end of both sides 2i, 2i below the seat 5, mounting parts 12, 12 are formed by bending outward, respectively. Press-molded integrally with the frame. Mounting portions 12, 12 protruding from both sides below the seat 5 have plate springs 13, 13.
The base portions 13a, 13a of the base portions 13a, 13a are fastened together with bolts and nuts 14, etc.

The leaf springs 13, 13 have a narrow plate shape as shown in FIGS. 1 and 4, and the base portions 13a are connected to the left and right sides of the lower part of the seat of the vehicle body frame via the mounting portions 12 as described above, and are moved rearward. It extends and is set to a length from the rear end of the frame to this side. The rear end portion of each leaf spring 13 is a free end, and this portion is bent into a loop shape to form each pivot support 13b. As a result, the leaf springs 13, 13 are accommodated to such an extent that they protrude slightly from the width of the vehicle body frame 2 to both sides.

A rear axle 15, which is a drive shaft, is installed transversely between the shaft supports 13b, 13b of each leaf spring 13, and both ends of the axle 15 are made to protrude outward from each shaft support 13b. The hub 4a of the rear wheel 4 is tied together. That is, the left and right rear wheels 4 are supported by the extending ends of each leaf spring 13, and the leaf springs 13 constitute a suspension member.
Therefore, the base 13a of the leaf spring 13 is tied to the frame side, and the rear wheel side is the free end, and the rear wheel 4 can elastically move up and down using the base 13a as a fulcrum, and is similar to a trailing arm but independent. This constitutes a suspension system that is close to suspension.

In addition to this, each leaf spring 13 of the axle 15
The support of the shaft support 13b is performed by interposing a mount rubber 17 between the inner diameter portion of the shaft support 13b and the holder 16 of the corresponding portion of the shaft 15. As a result, the left and right rear wheels 4 are elastically suspended from the vehicle body by the leaf springs 13, and are also elastically supported by the leaf springs 13, increasing the damping effect of the rear wheels.
In addition, the mount rubber is used to effectively follow the left and right rear wheels during cornering. Since the rear wheel is cantilever supported by the leaf spring 13, in addition to the above-mentioned trailing arm type effect, the length of the leaf spring 13 can be made as short as possible while extending rearward. It is possible to increase the vertical suspension stroke while keeping the length short. This allows the wheelbase to be shortened in relation to the front wheels 3.

The engine is composed of a unit 20 consisting of an engine body 18 and a transmission case 19 that are integrally assembled. This unit 20, as shown in FIG.
Space 2 located on the lower side of e and opened 2f, 2g
It is installed in the part facing h. At the top of the engine 18, brackets 18a are installed spaced apart from side to side, and these brackets 18a, 18a are connected to the lower ends of a pair of suspension plates 22, 22 via mount rubbers 21, respectively, with bolts and nuts 23. Supported. On the other hand, a bracket 24 is suspended from the lower surface of the rear part 2e of the frame 2, and a mounting pin 26 is installed across the center of the bracket 24 via a mount rubber 25. , the pin 26 is shown as a bolt,
Both 22, 22 were tied together with a nut 26a.

As a result, the unit 20 is housed in the downwardly open space 2h of the frame rear part 2e, and is suspended and supported from the frame 2 by the mount rubber. The mount rubber is supported at three points: two points 21, 21 on the unit 20 side and one point 25 on the frame 2 side, and the unit 20 is supported by the movement of the rear wheels 4, 4.
The system smoothly follows the engine front and rear, left and right, and up and down, elastically supports and protects the engine, and allows the power unit type engine to follow the engine when cornering. Furthermore, the vibrations of the rear wheel 4 and the engine 18 are effectively damped through the mount rubber, and the vibration damping effect is also excellent.

In addition to the above, the mount portion of the unit 20 is disposed at the middle part in the width direction between the rear wheels 4, 4, and approximately at the middle part in the length direction of the leaf spring 13, as shown in FIG. The power unit, which is a heavy item, was mounted effectively, improving space utilization, and was mounted in a position that was favorable from the standpoint of rigidity in terms of layout. Since the unit is disposed midway between the left and right rear wheels 4, 4, the left and right balance at the rear of the vehicle is favorable, and inertia during cornering can be effectively dealt with.

Furthermore, the unit 20 including the engine 18 is
It is coupled to the previously described rear axle 15. That is, the axle 15
is divided into two parts 15a and 15b in the axial direction, and each is coupled on the same axis to output shaft parts 19a and 19b protruding from both sides of the transmission case 19 at the rear of the unit 20. The engine and axle are thus connected to form a power unit integrated with the axle. The unit 20 is disposed on the axle of the rear wheels 4, 4, and the unit 20 is disposed on the axle at an intermediate position in the vertical and horizontal directions. Therefore, the unit 20 including the engine 18 is installed at a low position in the frame, and the center of gravity is lowered, which lowers the center of gravity where the rider rides on the seat 5 like in a scooter, thereby preventing adverse effects such as inertia during cornering and improving stability. can significantly improve performance. Furthermore, since the unit and the axle are connected on the same axis, it is extremely advantageous in terms of space, and the structure is extremely simplified, such as not requiring a transmission system.

As described above, the power unit 20 is installed in the lower open space 2h of the frame rear part 2e in the above layout, which is effective in terms of space utilization, improves stability, and simplifies the transmission and drive system, allowing the engine to be built with a minimum number of parts. Can be mounted effectively.

Furthermore, in the illustrated example, the rear lower surface is open and this part is sloped, so that the wind passing under the intermediate part 2c of the frame 2 is guided by this slope, passes around the engine 18, and has a forced cooling effect on the engine 18. It is also preferable for cooling the engine.

In Fig. 3, 27 is a carburetor, 28 is an air cleaner, and 29 is a muffler.

6 to 8 show the front part of the vehicle according to the present invention.

At the front part 2a of the frame 2, there are leaf springs 30 at the top and bottom.
31 will be erected across. The leaf springs 30, 31 are shaped like narrow plates, and their intermediate portions are connected to the upper and lower parts 2j, 2k of the frame front part 2a via bolts and nuts 32 and holders 33, 33. Leaf spring 3
Both end portions of 0 and 31 extend outward from both left and right sides of the frame 2, and both end portions are bent in the same direction to form support portions 30a and 31a. Both sides of the upper and lower parts 2j and 2k of the front part 2a of the frame are curved on one side.
1, the other side is inclined 2 m, and also serves as a stopper for the leaf springs 30 and 31.

A king pin 34 is provided vertically between both ends of the leaf springs 30, 31 in the vertical direction, and the upper and lower parts of the king pin 34 are connected and supported to the end parts 30a, 31a of the leaf spring via a mount rubber 35, Buffering is provided by the spring and by the rubber 35. Knuckles 36 are fixed to the left and right king pins 34, 34, and the front wheels are connected to each other via these 36.
The front axles 37 rotatably support the hubs 3a. In this way, the left and right front wheels 3, 3 are supported by the ends of two horizontally placed leaf springs 30, 31 provided so as to sandwich the front part 2a of the frame 2 above and below.
The leaf springs 30 and 31 constitute a front wheel suspension member and also serve as a shock absorber.

By doing this, the front wheels 3, 3 are supported by the shock absorbers and the leaf springs that also serve as suspension members, and the front wheels can be effectively suspended and buffered with a minimum number of parts. Because it is supported by the front wheel, it is possible to securely hold the front wheel's camber.

The lower end of the steering shaft 6 mentioned above faces into the opening 2n provided in the leaf spring 30 of the frame, and is rotatably supported by a bracket 38 attached to the cross member 2b. Connect the arm 39 to the left and right tie rods 41, 4 through the joint 40.
1, and these 41, 41 are connected to each of the aforementioned knuckles 36 via joints 42.
As a result, the steering movement of the steering bar 9 is transmitted to the shaft 6, arm 39, tie rod 41, and nutcle 36, causing the left and right front wheels 3, 3 to rotate about the hinge pin 34 for steering.

9 and 10 are specific external views of the vehicle according to the present invention, in which a cover 43 is installed around the steering shaft 6 and a cover 4 is installed at the front of the frame.
4 is installed, and furthermore, fender 4 is installed on the left and right front wheels 3, 3.
5 was covered. In addition, a cover 46 that also serves as a fender for the rear wheels 4 and a cover for the leaf spring 13 is provided at the rear of the frame.
We covered each part to improve the appearance and protect each part.

Although the illustrated embodiment has been described in detail above, the present invention is not limited to a four-wheeled vehicle with two front wheels as shown in the illustrated example, but it is of course possible to use a tricycle with one front wheel.

As detailed above, according to the present invention, in order to obtain a motorized four-wheeled vehicle similar to a two-wheeled vehicle, the suspension and mount of the rear wheel and power unit can be elastically and effectively supported within a limited space. It can be achieved with a simple structure using the smallest number of parts. In addition, the width of the vehicle is made approximately equal to the seat, and leaf springs are extended below the seat on both sides, and the left and right rear wheels are cantilever-supported by these. This allows for sufficient tread in a limited space, while also allowing the front wheels to The wheelbase between can be set as short as possible,
Although it has four wheels, its external dimensions can be kept to the same level as a motorized two-wheeled vehicle, and it is small, lightweight,
It is possible to achieve simplification and obtain a vehicle that is easy to handle and operate. Furthermore, by directly connecting the axle and engine, the center of gravity is lowered as much as possible, improving the stability of a scooter-like vehicle, making it easy to maneuver and providing a stable vehicle, while also opening the frame downward. Since the engine is arranged in a channel-like space, it is extremely convenient for protecting the engine and utilizing space, and is also preferable for cooling the engine. Furthermore, since the front wheel is placed horizontally and supported by two leaf springs sandwiching the frame, it serves both as a suspension for the front wheel and provides effective elastic support with a minimum number of parts. The front wheel camber is also securely maintained.

In short, the present invention solves all the various problems in obtaining a small, lightweight, and simple four-wheel vehicle, etc., and is extremely useful in putting this into practical use.

[Brief explanation of drawings]

The drawings show one embodiment of the present invention, in which Fig. 1 is a schematic plan view of the vehicle, Fig. 2 is a side view of the same, Fig. 3 is an enlarged side view of the rear part with a part cut away, and Fig. 4 The figures are a sectional view taken along the line 4-4 in FIG. 3, a vertical side view of the frame, FIG. FIG. 9 is a concrete external view of the vehicle, showing its plan view, and FIG. 10 is a side view of the same. In the drawings, 1 is the vehicle, 2 is the frame, 2h is the space, 3 is the front wheel, 4 is the rear wheel, 5 is the seat, 12 is the leaf spring attachment part, 13 is the leaf spring, 15 is the axle, 18 is the engine, and 20 is the Power unit, 17, 21, 2
5 is a mount rubber, and 30 and 31 are horizontal plate springs.

Claims (1)

[Scope of utility model registration request] The intermediate part of the vehicle body frame extending with a width approximately equal to the width of the seat is formed to have a low floor, and the rear part of the frame is continuous with the rear end of this intermediate part and has a channel-shaped cross section that is open downward, and is formed at a higher position than the intermediate part. , a seat is arranged on the rear part of the frame, and mounting parts are provided on both sides of the rear part of the frame below the seat, parts of which are bent outward, and each of these mounting parts has a plate extending rearward. One end of the spring is tied together, the rear ends of both leaf springs support the axles of the left and right rear wheels, the engine is disposed between the left and right leaf springs in the space below the seat, and the rear end of the engine is is supported at the intermediate portion of the axle, and an elastic attachment portion to the vehicle body frame is provided at the intermediate portion of the engine, and the engine is supported to the vehicle body frame via a suspension plate that hangs down from the vehicle body frame at this attachment portion. A running vehicle characterized by the following features: